Teach startup jobs to optionaly prevent the application start on failure

[nulltoken]

Pull request description

Related:

• feat: Startup Jobs are run before anything else is running #121 (comment)
• feat: Startup Jobs are run before anything else is running #115 (comment)

PR meta checklist

• Pull request is targeted at main branch for code
• Pull request is linked to all related issues, if any.

Code PR specific checklist

• My code follows the code style of this project and AspNetCore coding guidelines.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• I have updated the appropriate sub section in the CHANGELOG.md.
• I have added, updated or removed tests to according to my changes.
  • All tests passed.

[codecov]

Codecov Report

Attention: Patch coverage is 92.10526% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/NCronJob/Execution/StartupJobManager.cs	90.90%	1 Missing and 1 partial ⚠️
src/NCronJob/Scheduler/JobWorker.cs	66.66%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/NCronJob/Configuration/Builder/JobOption.cs	100.00% <100.00%> (ø)
...NCronJob/Configuration/Builder/JobOptionBuilder.cs	88.88% <100.00%> (ø)
...Job/Configuration/Builder/NCronJobOptionBuilder.cs	88.28% <100.00%> (ø)
src/NCronJob/Execution/JobExecutor.cs	97.00% <100.00%> (ø)
src/NCronJob/Registry/JobDefinition.cs	95.23% <100.00%> (+0.23%)	⬆️
src/NCronJob/Registry/JobRegistry.cs	98.01% <100.00%> (ø)
src/NCronJob/Registry/JobRun.cs	98.63% <100.00%> (-0.02%)	⬇️
src/NCronJob/Registry/JobState.cs	77.77% <100.00%> (+11.11%)	⬆️
src/NCronJob/Scheduler/JobProcessor.cs	100.00% <100.00%> (ø)
src/NCronJob/Scheduler/JobWorker.cs	93.43% <66.66%> (+0.04%)	⬆️
... and 1 more

[linkdotnet]

LGTM - same smaller hints from my side, up to you, whether or not they are important